Tmprss2 维持了上皮屏障的完整性和跨皮的运输
Olivia J Rickman1, Emma Guignard1, Thomas Chabanon1
1Department of Biomedical Sciences, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland.
Life science alliance
|January 3, 2024
概括
血清蛋白酶Tmprss2通过通过ENaC调节运输和通过EpCAM和claudins调节细胞透性来维持脏上皮功能. 它的缺失破坏了这些屏障,使上皮层有漏洞.
科学领域:
- 腎臟病學 (nephrology) 是一種醫學.
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 小鼠脏mCCD细胞形成一个紧密的上皮,对离子和水的运输至关重要.
- 皮质通道 (ENaC) 控制了的进入和跨皮质运输.
- Tmprss2是一种与膜结合的血清蛋白酶,与ENaC的α子单元共同表达.
研究的目的:
- 研究Tmprss2在调节小鼠皮层收集管细胞中的ENaC活性和上皮屏障功能的作用.
- 阐明Tmprss2通过哪些分子机制影响跨体运输和半细胞透性.
主要方法:
- 对Tmprss2和αENaC的同表达分析.
- 在Tmprss2-缺少细胞中对横体运输的评估.
- 用RNA测序来识别Tmprss2-调节的基因.
- 免疫组织化学证实蛋白质表达变化.
主要成果:
- 缺少Tmprss2会降低αENaC基因和蛋白质的表达,从而取消运输.
- 由于Tmprss2缺乏,导致CAP3/St14,EpCAM,Claudin-7和Claudin-3的表达减少.
- 丧失Tmprss2的功能会导致外皮漏,从而损害ENaC介导和细胞运输.
结论:
- 在维持上皮质完整性方面,tmprss2起着双重作用.
- Tmprss2调节了以ENaC为媒介的运输,可能通过对αENaC的转录控制.
- Tmprss2通过影响EpCAM和克劳丁表达,可能通过CAP3/St14信号传递,影响着对细胞屏障的功能.
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